22 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.40[1] |
| Characteristics | |
| Spectral type | kA7hA8mF2(III)((Sr II))[3] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: –70.131[2] mas/yr Dec.: +26.084[2] mas/yr |
| Parallax (π) | 10.2279±0.1491 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 0.65[1] |
| Details | |
| Mass | Script error: No such module "val".[4] Template:Solar mass |
| Radius | Script error: No such module "val".[2] Template:Solar radius |
| Luminosity | Script error: No such module "val".[2] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[4] cgs |
| Temperature | Script error: No such module "val".[2] K |
| Metallicity [Fe/H] | Script error: No such module "val".[1] dex |
| Rotational velocity (v sin i) | Script error: No such module "val".[1] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[5] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
22 Boötis is a single[6] star in the northern constellation of Boötes,[5] located 319 light years away from the Sun.[2] It has the Bayer designation f Boötis; 22 Boötis is the Flamsteed designation.[5] This object is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.40.[1] It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s.[1]
This is an Am star[7] with a stellar classification of kA7 hA8 mF2 (III) ((Sr II)),[3] showing the calcium K line of an A7 star, the hydrogen lines of an A8 star, and the metal lines of an F2 star. It has the luminosity class of a giant star and does not appear to be variable.[7] The star has twice[4] the mass of the Sun and four[2] times the Sun's radius. It is spinning with a projected rotational velocity of 38[1] km/s. 22 Boötis is radiating 52[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,528 K.[2]
References
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- ↑ a b c d e f g h i j Script error: No such module "citation/CS1".
- ↑ a b c d e f g h i j k l Template:Cite DR2
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".